Explanatory notes
… in forms unworked as drawn, or in the form of cylinders or rods, they are classified in Chapter 28 . (2) Chemical … etc., containing certain additives (e.g., germanium, iodine) generally in a proportion of a few per cent, with a … their use in electronics, whether in the form of cylinders, rods, etc., or cut into discs, wafers or similar forms. The …